C# Inheritance stackoverflow exception

Acces to list in Form1 without creating a new instance

I'm currently working on a calculator with reverse polish notation to learn about stacks, abstract classes, inheritance etc. I get a stackoverflow error when i try to inherit from Form1 in my abstract class.

The question is: Is there a way to prevent this error from happening and get acces to two lists in my Form1? When i use Form1 form1 = new Form1(); I create a new instance of Form1, and the result is an empty list, so i was thinking about inheriting Form1.

I inherit from this class, because I'm trying to reach this two lists in my Form 1:

In the Form1 class i've got 2 lists:

public List<string> lastEventList = new List<string>();
public List<string> stackDisplayList = new List<string>();

This is my abstract class:

abstract class Stack : Form1
    {
        ListBox lastEvent, stackDisplay;
        public Stack() { }
        public Stack(ListBox lastEvent, ListBox stackDisplay)
        {
            this.lastEvent = lastEvent;
            this.stackDisplay = stackDisplay;
        }
        public abstract int Pop();
        public virtual void Push(int i)
        {
            //how to acces list
            lastEventList.Add("Pushed " + i + " on stack");
            ((CurrencyManager)lastEvent.BindingContext[lastEventList]).Refresh();
            string addItem = String.Format("[{0}] \t -> \t {1}", 11 - Count(), i);
            stackDisplayList.Add(addItem);
            ((CurrencyManager)stackDisplay.BindingContext[stackDisplayList]).Refresh();
        }
        public abstract int Count();
    }

Do you know how to prevent the stackoverflow error and get acces to those lists?